DBLINK_CONNECT_U(3)

💅 DBLINK_CONNECT_U(3) — like dblink_connect but make it insecure 🫶

okay bestie, so this one lives in the PostgreSQL 14.24 Documentation and honestly the name alone is giving chaos: DBLINK_CONNECT_U. Buckle up 💖

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✨ NAME ✨

dblink_connect_u — opens a persistent connection to a remote database, insecurely 😭

no bc that's literally what it does, the insecurely is doing a LOT of heavy lifting there.

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✨ SYNOPSIS ✨

dblink_connect_u(text connstr) returns text
dblink_connect_u(text connname, text connstr) returns text

two signatures, pick your fighter 🎀

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✨ DESCRIPTION ✨

okay so dblink_connect_u() is identical to dblink_connect(), with exactly one (1) difference and it's a spicy one: it'll let non-superusers connect using any authentication method. yep. any. 🌈

and like, that's where it gets scary �� so hear me out:

• if the remote server picks an authentication method that doesn't involve a password, then impersonation and subsequent escalation of privileges can literally occur 😭 because the session will appear to have originated from the user as which the local PostgreSQL server runs. main character energy but in the worst way 💀
• and even if the remote server does demand a password, the password can totes be supplied from the server environment — like a ~/.pgpass file belonging to the server's user 🍓 and that opens up not just the risk of impersonation, but also the possibility of exposing a password to an untrustworthy remote server. not the vibe. not even a little. 🙈

so because of all that, dblink_connect_u() is initially installed with all privileges revoked from PUBLIC, which makes it un-callable except by superusers. locked down, as it should be 👑🔒

in some situations it may be appropriate to grant EXECUTE permission for dblink_connect_u() to specific users who are considered trustworthy — but bestie, this should be done with care. fr fr. 🫶

it's also recommended that any ~/.pgpass file belonging to the server's user not contain any records specifying a wildcard host name. just don't 💅

for further details see dblink_connect(). iykyk ✨

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and that's the whole page, no cap 🧚 straight from PostgreSQL 14.24, dated 2026 — periodt. 💜